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Note 3 - Inventories (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
As of December 31,
 
       
(in thousands)
 
2015
 
 
2014
 
Unprocessed
  $ 163,942     $ 238,226  
Processed and finished
    42,703       72,882  
Totals
  $ 206,645     $ 311,108